What is required to file a mechanic’s lien against an aircraft? The FAA will accept and record a filing for all but a few states. Some states, such as Wisconsin, Colorado, Alabama, Hawaii, Delaware, do not have laws that provide for filing with the FAA. Each state has its own timing requirements for when the lien must be filed with the FAA. Although the FAA does not have a required form for the filing, it does have specific requirements for the information that must be contained in the filing. Typically, the form is titled Notice of Mechanic Lien or Verified Statement of Mechanic Lien. It must contain the N-number, make and model of the aircraft, the dollar amount of the claim and the date of last work. The form must be signed in ink and filed with the FAA along with a $5.00 filing fee. The laws governing aircraft mechanic’s liens for each state vary, so you should contact an aviation attorney to determine the requirements for your particular state.